Identification of Diffusion Transport Properties from Desorption/Sorption Kinetics:  An Analysis Based on a New Approximation of Fick Equation during Solid−Liquid Contact

2006 ◽  
Vol 45 (23) ◽  
pp. 7941-7956 ◽  
Author(s):  
Olivier Vitrac ◽  
Murielle Hayert
Keyword(s):  
Transport Properties ◽  
Sorption Kinetics ◽  
Diffusion Transport ◽  
Solid Liquid ◽  
Fick Equation

Calculation of Mechanical, Thermodynamic and Transport Properties of Metallic Glass Formers

1998 ◽  
Vol 554 ◽  
Author(s):  
Tahir Çağin ◽  
Yoshitaka Kimura ◽  
Yue Qi ◽  
Hao Li ◽  
Hideyuki Ikeda ◽  
...  
Keyword(s):  
Transport Properties ◽  
Lattice Dynamics ◽  
Body Force ◽  
Binary Alloys ◽  
Many Body ◽  
Glass Transformation ◽  
Model Glass ◽  
Dynamics Simulations ◽  
Solid Liquid ◽  
Crystal Phase Transformation

AbstractRecently, we have parametrized Sutton-Chen type empirical many body force fields for FCC transition metals to study the thermodynamic, mechanical, transport and phase behavior of metals and their alloys. We have utilized these potentials in lattice dynamics calculations and molecular dynamics simulations to describe the structure, thermodynamic, mechanical and transport properties of pure metals and binary alloys in solid, liquid and glass phases. Here, we will describe these applications: mechanical properties of binary alloys (Pt - Rh) and viscosity of a binary alloy, (Au - Cu), as a function of composition, temperature, and shear rate, crystal-liquid, liquid-crystal phase transformation in (Ni - Cu), liquid to glass transformation in a model glass former, (Ag - Cu).

Diffusion-transport properties of a polycomplex matrix system based on eudragit® EPO and Carbomer 940

2010 ◽  
Vol 44 (3) ◽  
pp. 147-150 ◽  
Author(s):  
R. I. Mustafin ◽  
T. V. Kabanova ◽  
E. R. Zhdanova ◽  
A. V. Bukhovets ◽  
V. R. Garipova ◽  
...  
Keyword(s):  
Transport Properties ◽  
Matrix System ◽  
Diffusion Transport ◽  
Carbomer 940

Evaporation and Diffusion Transport Properties and Mechanical Properties of Alginate Dried Film

2013 ◽  
Vol 32 (1) ◽  
pp. 117-125 ◽  
Author(s):  
Tin Wui Wong ◽  
Wan Hussin Noor Shimariza Ashikin ◽  
Chung Lim Law
Keyword(s):  
Mechanical Properties ◽  
Transport Properties ◽  
Diffusion Transport ◽  
And Diffusion

The Thermal Transport Properties of Ethylene Glycol Based MGO Nanofluids

2009 ◽  
Author(s):  
Wei Yu ◽  
Hua-Qing Xie ◽  
Yang Li ◽  
Li-Fei Chen
Keyword(s):  
Thermal Conductivity ◽  
Ethylene Glycol ◽  
Transport Properties ◽  
Volume Fraction ◽  
Metallic Oxide ◽  
Mgo Nanoparticles ◽  
Conductivity Enhancement ◽  
Classical Models ◽  
Constant Viscosity ◽  
Solid Liquid

Ethylene glycol based nanofluids containing MgO nanoparticles (MgO-EG) were prepared, and the transport properties including thermal conductivity and viscosity were measured. The results show that the thermal conductivity of MgO-EG nanofluid depends strongly on particle concentration, and it increases nonlinearly with the volume fraction of nanoparticles. The thermal conductivity of MgO-EG nanofluids is larger than that of nanofluids containing the same volume fraction of TiO2, ZnO, Al2O3 and SiO2, maybe due to its lowest viscosity among the tested metallic oxide nanofluids. Thermal conductivity enhancement of MgO-EG nanofluids appears weak dependence on temperature from 10 to 60°C, and the enhanced ratios are almost constant. Viscosity measurements show that MgO-EG nanofluids demonstrate Newtonian behavior, and the viscosity significantly decreases with temperature. The thermal conductivity and viscosity increments of nanofluids are higher than those of the existing classical models for the solid-liquid mixture.

Removal of Arsenic from Aqueous Phase by Nanoparticle Agglomerates of Hydrous Iron(III)-Chromium(III) Bimetal Mixed Oxide: Effects of Background Ions on the As(V) Sorption Kinetics and Equilibrium

2010 ◽  
Vol 45 (4) ◽  
pp. 437-449 ◽  
Author(s):  
Tina Basu ◽  
Kaushik Gupta ◽  
Uday Chand Ghosh
Keyword(s):  
Mixed Oxide ◽  
Freundlich Isotherm ◽  
Sorption Kinetics ◽  
Oh Groups ◽  
Equilibrium Data ◽  
Increasing Temperature ◽  
Solid Liquid Interface ◽  
Removal Of Arsenic ◽  
Solid Liquid ◽  
Background Ions

Abstract The influence of some groundwater occurring ions was investigated on As(V)-sorption by agglomerated nanoparticles (40-50 nm) of synthetic hydrous iron(III)-chromium(III) mixed oxide (NHICO). Solubility tests of NHICO suggested that it could be used safely for As(V) removal at pH = 6.4 ± 0.1 by agitation (speed: 350 ± 5 rpm) for an hour. Kinetic data obtained in the presence of applied ions for this reaction were well described by the pseudo-second order equation (0.98 < r2 <1.00, 0.04 < x2 < 0.18). Good agreement of the equilibrium data with the Freundlich isotherm (0.96 < r2 <1.00, 0.41 < x2 < 6.30) suggested that the NHICO surface was heterogeneous. Adequate fitting of the data with the Redlich-Petterson (0.96 < r2 <1.00, 0.65 < x2 < 7.83) isotherm with g < 1.0 confirmed the conclusion drawn. The positive enthalpy (ΔH0) and entropy (ΔS0) changes indicated that the endothermic As(V)-sorption reaction in the absence/presence of ions was driven by an entropy increase at the solid-liquid interface. Negative values of free energy change (ΔG0) indicated that the reaction spontaneity increased with increasing temperature. The sorption of As(V) by NHICO occurred via an ion-exchange mechanism (mean sorption energy, EDR = 8.98 to 11.47 kJ. mol-1) involving surface M-OH groups.

Sorption of microconstituents onto primary sludge

2015 ◽  
Vol 72 (5) ◽  
pp. 779-784 ◽  
Author(s):  
Zhu Ying ◽  
R. L. Droste
Keyword(s):  
Wastewater Treatment Plants ◽  
Sorption Kinetics ◽  
Isotherm Models ◽  
Rate Model ◽  
Primary Sludge ◽  
Order Rate ◽  
Pseudo Second Order ◽  
Partitioning Coefficients ◽  
Solid Liquid ◽  
Kinetics And Isotherms

The presence of microconstituents (MCs) in the environment has become an emerging concern to scientists and engineers. Sorption is one of the important removal mechanisms for MCs in wastewater treatment plants (WWTPs) since there is significant sludge production. The purpose of this study is to explore sorption kinetics and isotherms of MCs onto primary sludge. Three MCs, bisphenol-A (BPA), 17-α-ethinylestradiol (EE2) and triclosan (TCS), were chosen for this study. They are hydrophobic and have low vapor pressure, which makes sorption a potential removal mechanism. Both sorption kinetics and isotherm experiments were conducted using primary sludge collected from a local municipal WWTP. The time to equilibrium was around 7 h for all chosen MCs. A pseudo second-order rate model was better at describing the sorption rate than a pseudo first-order rate model. Linear sorption isotherm models were found to fit the experimental data, and the solid–liquid partitioning coefficients for BPA, EE2 and TCS were 81, 728 and 6,407 L/kg.

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